emmens



(No Model.)

S. H. EMMENS IIVOANDESGEN'VT ELBGTRIG'LAMP. 7 No. 267,647. Patented Nov. 14, 1882.

Ficha.

I i Era/$477100 Y,

N. PETERS. Praia-lithograph", Washinglcn. 04c

.- UNITED STATES PATE T OFFICE.

, STEPHEN HENRY EMMENS, or LONDON,OOUNTY or M1DDLEsEx,ENeLAND.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 267,647, dated November 14, 1882.

Application filed September 6, IP82.

To all whom it may concern Be it known that I, STEPHEN HENRY EM- MENS, a subject of the Queen of Great Britain, residing at London, in the county of Middlesex, England, have invented a new and useful Improvement in Electric Lights, of which the following is a specification.

' This invention relates to electric lamps dependent for their luminosity upon the incandescence of bridges or conductors of carbon or other suitable substance of high electrical resistance, in vacuo, or 'in petroleum, bisulphide of carbon, or other suitable gas or vapor.

It is designed to afibrd at will a highly diffused light and to proi'idei'or readily regulating the quantity of light from any single lamp, and for extinguishing the same, by short-circuitin g, without complication of parts. These objects 1 effect in the; manner illustrated in the drawings herewith and forming part hereof, in which- Figure 1 is an elevation of my lamp. Fig. 2 is a vertical section of the same. Fig. 3 is a plan view; and Fig. 4is a diagrammatic development in plan of the carbons and connections, like letters of reference indicating cor- I responding parts in the several figures.

A may represent the outer'part of the lamp, composed of a transparent bulb or globe and a hollow base, whichj may be of any approved description. Within the bulb I arrange a series of small incandescingconductors or hr-idges,"

B, four in the example, which are disposed.

around a circle concentric with the bulb,ias shown in Figs. 1 and 3. Metallic connections comprising a corresponding circular series of anvils, 1 2 3 4 5, within the hollow base of the lamp unite the bridges B with each other, as

shown in Figs. 2 and 4, and provide for readily connecting the whole in series with the conducting-wires leadinginto and outoi" thelamp, so as to produce by their joint luminosity a highly-difl'used light. To provide by the same means in part for regulating the luminosity of the lamp and for extinguishing the light by short-circuiting the electricity at the lamp 1 provide a switch or tap formed by a rotary contact-piece, 0, within the said hollow base (N0 model.)

of the lamp in combination with the said series of anvils 1 2 3 4 5, said contact-piece 5o havinga vertical arbor in line with the axis of the lamp, and provided with an external thumb-piece, D, by means of which said contact-piece is conveniently rotated. The wire E leading from the source of electricity into the lamp is connected permanently with the first ofthe said series of anvils1,a nd thewire F leading out of the lamp is connected with the said contact-piece 0 through its arbor. In the position of the dontact-piece 0 represented by Fig. 4, the current of electricity entering the series of bridges B at 1 and leaving at 5 renders the Wholeseriesincandescent. If, now,

0 be turned upon 4, it will be seen that only three of the four bridges will be in circuit; if G be turned upon 3, only two bridges will be in circuit; it'G be turned upon 2.,only one bridge will be in circuit, and if G be'turned upon 1, thelamp will be short-circuited and extinguished.

I do not claim herein broadly the combina tion in one electriclamp oftwo or more incandescing conductors, a single electric circuit leading thereto, and a circuit-controller therein, as I am aware that these elements have before been combined in another lamp.

I claim as new and desire to protect by Letters Patent of the United States- The combination, in an electric lamp, of the within-described series of incandescing bridges B, arranged around a circle within. and concentric With the bulb of the lamp, metallic connections comprising acorresponding series I of anvils uniting said bridges with each other and with a wire leading from a source of electricity, the rotary contact-piece 0, connected with a wire leading out of the lamp, and the thumbpiece D, for turning said contactpiece into difl'erent positions, substantially as herein specified, for the purposes set forth.

London, J une 16, 1882.

sTEPEEN HENRY EMMENs.

Witnesses:

' JAMES SIMMONS,

S. P. VVILDING. 

